螺杆挤压加工对干香菇可溶氮及氨基氮影响的研究

Study on the Effect of Screw Extrusion Processing on Soluble Nitrogen and Amino Nitrogen of Dried Lentinus Edodes

摘要:

为提高香菇可溶性含氮化合物的溶出，采用螺杆挤压处理，研究了筒体温度、螺杆转速、喂料速度、物料含水量以及蛋白酶解的影响。实验结果，以NSI、氨基态氮为主要指标辅以其他物理特性参数，确定螺杆挤压最佳工艺参数为：螺杆转速25 r/min，物料含水量10%，筒体温度160 ℃，喂料速度9 r/min，此时NSI可达73.93%。各因素对NSI影响次序为：螺杆转速＞物料含水量＞筒体温度＞喂料速度。进一步采用胰蛋白酶酶解可使NSI及氨基态氮含量分别提高94.94%、82.94%。

Abstract:

To improve the dissolution of mushrooms soluble nitrogen compounds, the screw extrusion processing was adopted and the effects of cylinder temperature, screw speed, feed rate moisture content of materials and protease hydodrlysis were studied. Experimental results showed that , using NSI and amino nitrogen as the main indicators combined with other physical parameters,the optimal parameters for the screw extrusion were determined as screw speed 25 r/min, the moisture content of materials 10%, barrel temperature 160 ℃and feed rate 9 r/min. under the optimum conditons, NSI value was up to 73.93 %. Various factors on the NSI of the order as follows: screw speed > moisture content of materials > cylinder temperature > feed rate. Further trypsin enzyme enables the NSI and the amino nitrogen content were increased by 94.94% and 82.94%, respectively.